How do blue light-filtering screen protectors work and should you buy one?

Best answer: Blue light filtering screen protectors use a special coating that blocks light in the 380-500 nanometer range. Electronics like phones use LED or OLED panels that emit light in this range to help brightness and improve clarity, but it can also reach the rear of the retina. Some studies claim this can be harmful, but so far there is no conclusive proof to this. What scientists and doctors do agree on, though, is that blue light can make it harder for us to get to sleep. To help with that, you'll need a proper screen protector.

Amazon: Samsung Galaxy Anti-Glare Screen Protector ($16)

Blocks what you don't wantBlock both Ultraviolet light and "blue light" with this curved 3D tempered glass screen protector. Available for the Galaxy Note 8, Galaxy Note 9, Galaxy S8 and S8+, Galaxy S9 and S9+.